[MLOB-2233] feat(openai, llmobs): patch _thenUnwrap of chat completion api promise instances

[sabrenner]

What does this PR do?

Closes #5233

Patches the APIPromise instance's _thenUnwrap returned for chat.completion calls.

This is done through instance patching, as opposed to prototype patching, which is normal for this OpenAI instrumentation, but is becoming a bit hectic. Even though this support is temporary, we will want to rework how this instrumentation is done in general. More notes below.

Motivation

Temporary tracing support for the client.beta.chat.completions endpoint by request. This is a one-off, and this support will be removed once the functionality on the beta client (mainly structured output) is on the main client itself.

This is the only beta method we will support tracing for.

Additional Notes

We can't just patch apiProm._thenUnwrap and call it a day because _thenUnwrap returns a new APIPromise, and we a) cannot return a normal Promise in it's place, so we b) instead opt to patch the parse method on that new APIPromise.

This instrumentation really needs a refactor. We're doing a lot of nested instance patching that could be done better by maybe patching the base APIPromise along with the APIClient to hoist the base API information. I will try to do this in a follow-up PR, but for now, I believe just modifying the current implementation is the best approach.

[github-actions]

Overall package size

Self size: 8.68 MB
Deduped: 94.88 MB
No deduping: 95.4 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.4.0 | 29.44 MB | 29.44 MB | | @datadog/native-appsec | 8.4.0 | 19.25 MB | 19.26 MB | | @datadog/native-iast-taint-tracking | 3.3.0 | 13.77 MB | 13.78 MB | | @datadog/pprof | 5.5.1 | 9.79 MB | 10.17 MB | | protobufjs | 7.2.5 | 2.77 MB | 5.16 MB | | @datadog/native-iast-rewriter | 2.8.0 | 2.6 MB | 2.74 MB | | @opentelemetry/core | 1.14.0 | 872.87 kB | 1.47 MB | | @datadog/native-metrics | 3.1.0 | 1.06 MB | 1.46 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.11.2 | 112.74 kB | 835.4 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.0 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | shell-quote | 1.8.1 | 44.96 kB | 44.96 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.3.1 | 25.21 kB | 25.21 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | dc-polyfill | 0.1.4 | 23.1 kB | 23.1 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.27%. Comparing base (b8c03bd) to head (141907f).
Report is 30 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/datadog-instrumentations/src/openai.js	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5253      +/-   ##
==========================================
+ Coverage   81.09%   81.27%   +0.18%     
==========================================
  Files         480      487       +7     
  Lines       21438    21709     +271     
==========================================
+ Hits        17386    17645     +259     
- Misses       4052     4064      +12     

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: sabrenner/openai-then-unwrap
Commit report: 9f64d64
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 627 Passed, 0 Skipped, 8m 46.82s Total Time